android.widget.BaseAdapter调用DataSetObservable.notifyChanged/Invalidated

在android.widget.BaseAdapter类中定义了两个notifyDataXXX方法。

public void notifyDataSetChanged() {
    mDataSetObservable.notifyChanged();
}

public void notifyDataSetInvalidated() {
    mDataSetObservable.notifyInvalidated();
}

void android.database.DataSetObservable.notifyChanged()

Invokes onChanged on each observer. Called when the data set being observed has changed, and which when read contains the new state of the data.

void android.database.DataSetObserver.onChanged()

This method is called when the entire data set has changed, most likely through a call to Cursor.requery() on a Cursor.

void android.database.DataSetObservable.notifyInvalidated()

Invokes onInvalidated on each observer. Called when the data set being monitored has changed such that it is no longer valid.

void android.database.DataSetObserver.onInvalidated()

This method is called when the entire data becomes invalid, most likely through a call to Cursor.deactivate() or Cursor.close() on a Cursor.